What does an excess flow feature in a liquid service valve do?

The excess flow feature in a liquid service valve is designed to automatically close when the flow of gas exceeds a predetermined safe rate. This mechanism is crucial for preventing accidents and potential hazards that could arise from excessive flow rates, which might indicate a leak or a failure in the system. When the flow reaches an unsafe level, the valve acts as a safety measure, shutting off the flow to protect both the equipment and operators from possible damage or unsafe conditions.

This safety feature is essential in managing the risks associated with handling pressurized liquids, ensuring that the system operates within safe parameters at all times. The ability of the valve to automatically close enhances the overall safety and reliability of the equipment it is part of.